Ron Roy on fri 23 jul 99
This a great looking glaze folks - if you don't have any idea of what F12
is - it's a Fusion leadless boron frit - Ferro frit #3124 is almost an
exact match. Make sure you test it first - glazes fit diffently on
different bodies.
Well I had to say something Alison - RR
>----------------------------Original message----------------------------
>It is with great trepidation that I am posting this glaze recipe. The
>last time
>posted a recipe - well, let's just say it did not survive the scrutiny of
>The-One-Who-Knows (a.k.a. Ron Roy).
>
>Posting the recipe changed my priorities which resulted in a huge detour in my
>pottery work; Ron's comments convinced me (kicking and screaming) that I needed
>know more about glaze calculation. It has not been a smooth path, but
>(drum rol
>please) here's a recipe that should pass muster, especially since half of it is
>his! (and if it doesn't work, blame my half of the recipe!) :)
>
>Ron kindly gave me a revision to a green glaze of mine that was crazing
>and I al
>made a revision. This recipe is a blend of these two revisions. I tested
>it fo
>the first time at Ron's course at Canadore College a few weeks ago and another
>student commented that it looked pretty close to a reduction celadon. Let
>me kn
>what you think.
>
>This is for Cone 6, oxidation.
>
>Ron-Ali's Green
>===============
> DOLOMITE............ 9.50 9.31%
> G-200 FELDSPAR G200. 38.50 37.75%
> SILICA.............. 17.00 16.67%
> F12................. 14.00 13.73%
> ZINC OXIDE.......... 2.00 1.96%
> BELL DARK BALL CLAY. 7.00 6.86%
> TALC................ 7.00 6.86%
> Tin Oxide........... 2.00 1.96%
> Manganese Dioxide... 2.00 1.96%
>*Copper carbonate.... 2.00 1.96%
> BENTONITE........... 1.00 0.98%
> ========
> 102.00
>
> CaO 0.36* 7.12%
> MnO2 0.07 2.13%
> MgO 0.31* 4.36%
> K2O 0.13* 4.40%
> Na2O 0.13* 2.84%
> ZnO 0.07* 2.13%
> Fe2O3 0.00 0.21%
> TIO2 0.00 0.11%
> B2O3 0.14* 3.53%
> AL2O3 0.28 10.00%
> SiO2 2.88 61.04%
> SnO2 .04 2.12%
>
> COST/KG 1.90
> Si:Al 10.38
> EXPAN 484.95
>
>
>Thanks, Ron.
>
>Alison Hamilton
>Trout Lake
>Dorset, ON
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
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